MP3, the original aristocratic product, has been accepted by the public, but the price of MP3 on the market is confusing, the same 128M MP3 how to have thousands of yuan and some only 300 yuan? What is the reason for the huge spread? The following is from the MP3 decoding chip for you to uncover the mystery. Before introducing the decoding chip, let's first understand the working principle of MP3: First of all, take out the MP3 song file from the storage (flash media, hard disk media, optical disc media) and read the signal on the memory → decode the signal to the decoding chip → convert the digital signal to analog signal through the digital-to-analog converter → enlarge the analog audio after conversion → low-pass filtering to the earphone output, and output is the music we hear. Decoding chip, its role as the name suggests is to decode the MP3 file on the storage. It largely determines the final sound quality. MP3 is a lossy compression format, if the MP3 player has an excellent decoding chip can better restore the quality of the audio signal, to a large extent make up for the loss of the audio signal.
On the contrary, the low-end decoding chip will cause further loss of MP3 encoded information. At present, the most common chips in MP3 players on the market are: Sigmatel, Actions, Sunplus (Sun), MosArt (Silicon), Atmel, Telechip, PHILIPS, etc. Philips SAA7750 \/ SAA7751 \/ PNX0101ET, Sigmatel STMP3410\/3420\/1342, telechips TCC730 \/ TCC731, as well as the Sunplus SPCA514A\/SPCA751A, These are the mainstream.